Changelog for Asset Modeller 0.16.0

Changes

• Fix Firefox rendering artefacts (PR, #6775)
• Add support for multi-line attributes (PR, #6693)
• Start inserting new asset just after new asset is saved (PR, #6764)
• Do not show confirmation dialog when deleting asset without children (PR, #6773)
• Improve multiuser table tree insert/edit - replace blur with click-away (PR, #6765)